Besides, each vacuum pipe is further equipped with a long electric heating pipe, a temperature and water level probe and a superconductive airflow pipe.
在其中的真空管内，还安装有长电加热管、温度水位探头和超导气流管。
At present, the ventilation pipes are generally made by concrete or PVC without holes on the pipe walls, whose cooling effects are realized by airflow and heat transference.
目前的路基通风一般采用路基内预埋实体混凝土管或PVC管，管壁不能透风，主要通过管内空气流动和热传导方式达到冷却路基的目的。
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